An O2 code doesn't always mean the O2 sensor is faulty needing
replacement. It can mean the car is running poorly and the O2
sensor is detecting a lean or rich condition. what was the 4 digit
code? Any others?

The trouble code should have told you if the problem was the up-
stream or down stream sensor and which bank. I agree with guys
above, the O2 sensor replacement may or may not fix the issue. If
you are convinced it is a bad sensor, then by all means replace it.

I have a 2012 Honda ridgeline and I just took it in to Honda dealership to get oil changed and they told me the transmission fluid needed changed. I was wondering if anyone could tell me how often sho...

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